Weighing machine



May 29, 1923. 1,456,631

H. D. ELFRETH WEIGHING MACHINE Filed Dec. 24, 1919 2 Sheets-Sheet 1 1 {k N WITNESS: INVENTOR AZ; ATTORNEY May 29, 1923.

H. D, ELFRETH WEIGHING MACHINE Filed Dec. 24, 1919 2 Sheets-Sheegt 2 INVENTOR M a W M O QB2 4; ATTORNEY WI TNESS:

Patented May 29, 1923.

UNITED STATES PATENT OFFICE.

HAROLD D. ELFRETH, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOB, BY MESNE ASSIGNMENTS, TO H. S. B. W.COCHRANE CORPORATION, OF PHILADELPHIA, PENN- SYLVANLA, A CORPORATION OF PENNSYLVANIA.

WEIGHING MACHINE.

Application filed December 24, 1919. Serial No. 347,096.

To aZZ whom it may concern.

Be it known that I, IIAROLD D. ELFRETH, a citizen of the United States of America, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Weighing Machines, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention'relates to weighing machines, and is especially, though not exclusively, intended for use in machines for weighing liquids. My invention has especial reference to that class of weighing machines in which the material to be Weighed is delivered in a tilting bucket yieldingly supported on weighing mechanism and so organized-that when a determinedweight of material is delivered into the bucket it will tilt and deliver its contents. Apparatus of this kind is quite generally constructed with tilting buckets arranged in pairs and in connection with mechanism by which the material from the source of supply is deflected from one bucket to the other. Weighing mechanism has also been devised in which a tilting bucket is used in combination with an intercepting receptacle combined with but not directly attached to the bucket, and so actuated that it will intercept and hold the material to be weighed while the bucket is in dumping position, and deliver its contents to the bucket when it is returned to normal receiving position.

The object of my invention is to provide a construction in which an intercepting receptacle will be attached to and form a part of the bucket structure, and a leading feature of my invention consists of a tilting bucket having an intercepting receptacle built into and forming a part of the upper portion of the bucket, and so arranged that when the bucket is in receiving position the liquid, or other material, will flow freely from the receptacle into the bucket and when the bucket is in tilting position the receptacle will receive and retain a considerable I quantity of the material to be weighed.

Another feature of my invention cona sts in so ba ancing the swinging ucket, so

locating the latch which holds it in position to be filled, and so disposing parts which might serve as stops to arrest the motion of the bucket, that the bucket will swing from a latch engaged position to its extreme dumping position, and back to latch engaging position without having its motion arrested by a stop other than the latch, thus avoiding the severe and destructive effect of the bucket striking against a stop or stops.

The nature and detail of my invention will be best understood as described .in connection with the drawings in which it is illustrated and in which Figure 1 is an elevation of a tank equipped with my improved weighing mechanism and taken on the line l] of Figure 2.

Figure 2 is a view of the same mechanism taken on the line 2-2 of Figure 1, and

Figure 3 is a view similar to Fig. 2, but on a larger scale and showing in dotted lines various positions of the bucket.

A indicates the tank, B a pipe or conduit connecting with the spout B, the'lower portion B of which extends, preferably, into the bucket, as shown. C is the outlet pipe from the tank and C a vent pipe. D, D are the arms of a pair of scale beams extending out oneach side of knife edges D supported, as shown, on brackets E, E, Two scale beams are, as shown, connected together at their ends by rods D and D D indicating a fixed weight secured on the rod D and the arms I) of the scale beams beiu;; formed, as shown, with lugs D D, forming supports and bearing for threaded rods G, on which adjustable weights H are supported.

I is a tilting bucket attached to shaft F, the ends of which have bearings in the arms D, D, of the scale beams. I*indicates the front or delivery end of the bucket, and I the rear end of the bucket which is preferably formed with an inwardly turned lip, as shown. J is an intercepting receptacle having, as shown. preferably, the form of a segment of a cylinder attached at its oppd site ends to the walls of the bucket, and having, as shown, its lower edge J so arranged that when the bucket is in normal receiving position, as shown in the drawings, material flowing i to the intercepting receptacle will,

tor the most part flow freely out and over its edge J into the bucket. The form of the receptacle, as a whole is such that when the bucket is in dumping position the receptacle will receive and retain a considerable quan tity of the liquid or Other material flowing into it. It will be understood that the inwardly turned lip on the edge I of the bucket is provided to prevent the material from flowing over the back of the bucket as it passes from the receptacle J into the bucket.

I: is a hoxlike structure secured to the upper end of the receptacle d and serving as a counterweight to balance the liiucket and as a support for a bracket K, which supports between bifurcated arms a rod K serving as a bearing tor a roller K L is a bracket secured as shown, to the spout B, and supporting on bifurcated arms a pivot pin L the bracket being); formed with an abutment indicated. at L. M, M is a bent lover pivoted on the bracket L, as shown, the arm M" being provided with an adjusting abutment screw N, the function of which is to hold the arm M in position to abut squarely against the roller K when the parts are in the position shown in 2.

In operation, and when the bucket l is empty, the parts will occupy the position shown in Fig. 2 and in full lines at (a in Fig. 3, the center i gravity of the empty bucket being, preferably, slightly on the right hand side of the pivot F. Yi hen the liquid or n'iaterial to be weighed flows in through. the spout B, B which extends through a space I lying between the upper end of the receptacle J and the rear end I of the bucket and is of suliicient breadth to permit of the desired tilting movement of the bucket, the material flowing into the receptacle J passes freely over its rear edge J into the bucket, and, as the material accumu lates in the bucket the center of gravity is shifted further to the right hand side of the pivot F, but the bucket is still held in re ceiving position by the abutment of the roller K against the lever arm l /lv hen material of the desired weight has been delivered into the bucket the arms D of the s ale meams move downward carrying; the bucket with them and moving," the attached roller K downward so that it is disengaged from. the lever arin M, whereupon the bucket turns on its pivotal support and dumps its contents into the tanlc and, while the bucket is in this dumping position the receptacle J is shifted. to a position in which it will retain the liquirh or other material, flowing into it through the spout.

When the conl fil ts of the bucket has been clump d the arms D, D. of the scale bean s risk carrying, of course, the bucket with them an the bucket turns back by gravity to receiving position, the roller K pushing the lei arin M u vard as it passes under it and latching against it as soon as it has cleared the end of the lever. During this backward motion of the bucket the contents ot the rcccptzu-le J poured into the bucket.

it will be obvious, o l ('UH i. that my construction enables an unintcrrupted flow ol' the material to be weiulicd to be mainta'ned.

is shown, and prci'crably, the shape ol the receptacle l is such that a small portion ot the liquid to be weighed is retained in the bottom ot the receptacle This dil'licult to avoid it the receptacle is to be given its maximum retaining capacity. but need not be materially objectionable as the weight oi" this retained material can be properly allo -Jed for in the adjustment ol' the wei hts on the scale beams.

l rc tcrablv, the but t is so counter- .YGwlQllllPtl and proportioned that its swinging movennents will. take place through an arc which will not bring it into arresting? contact with any S-TJOQ other than the latch whi h hole; it in filling" po ion, and tins newsma but its arc inovcuient shall not in contact with the spout B where the bin let and spout are constructen 21W! arranged as illustrated. il' ith this purpose in view i so balance the ln' ckct' that when empty and unlatchcd it will occupy the position indicated in if" 1 2 at a, and when per tted to turn ia\'itall v from position u it with when empty, swing to position (i and then back, i'nning' to rest in position a.

'lhe term and balance of the bucket is such that vii-en lill'ed it will when. unlatched from position (I, swing to position a, and having: dumped its contents, swing back to or slightly beyond position a, so as to l't-tiilgtlfl'tfi it with the latch. By so balancin' 3 all noise and jar arising the llll from the bucket striking against stops is eliminated.

Having now described my inventioinwhat I claim as new and desire to secure by Letters Patent, is:

1. A tilting; bucket for weighing machines having; an intercepting receptacle secured to it, and so arranged that when the bucket is in normal receiving position the material to be weighed will flow lreely from the receptacle into the bucket, and when the bucket tilts to de iver its contents said receptacle will be turned to a position in which it will. retain a considerable quantity o1": said material.

2. A, tilting bucket tor weighing Inachines having an intercepting receptacle secured to it, and so arranged that when the bucket is in normal receiving); position the material to be weighed will flow freely from the receptacle into the bucket, and when the bucket tilts to deliver its contents said receptacle will be turned to a position in which it will retain a considerable quantity til of said material, said bucket having a retainin r lip vat its rear or non-delivery end.

3. f5 a weighing machine a pivotally supported tilting bucket in combination with an intercepting receptacle secured toits upper part and moving with the bucket, said receptacle being so formed that when the bucket is in receiving position the material to be weighed will flow freely from the receptacle 'into the bucket and that when the bucket is tilted it will retain a considerable quantity of such material, and a delivery spout arranged to deliver material to said intercepting receptacle in all positions of the bucket.

4. In a weighing machine a pivotally supported tilting bucket in combination .with an intercepting receptacle secured to its upper part and moving with the bucket, said receptacle being so formed that when the bucket is in receiving position the material to be weighed will flow freely from the receptacle into the bucket and that when the bucket is tilted it will retain a considerable quantity of such material, and said receptacle being so placed in the bucket as to have a space between its upper end and the rear edge of the bucket, and a delivery spout passing through said space arranged to deliver material to said intercepting receptacle in all positions of the bucket.

5. In a weighing machine a pivotally supported tilting bucket having an inwardly turned lip at its rear upper edge, in combination with an intercepting receptacle secured to its upper part and moving with the bucket, said receptacle being so formed that when the bucket is in receiving position the material to be weighed will flow freely from the receptacle into the bucket, and that when the bucket is tilted it will retain a considerable quantity of such material, and a delivery spout extending into the intercepting receptacle between its upper edge and the lip on the rear edge of the bucket.

6. A weighing machine having in combination a tilting bucket formed and counterweighted as described so as to come to a normal position of rest when unloaded intermediate its latch engaging and its load discharging position and so as to swing from latch engaging to load discharging and back to latch engaging position, said machine having no stop in the path of the bucket other than the latch, a latch for holding the bucket in filling position, and weight actuated mechanism for disengaging the bucket from the latch.

7. A weighing machine having a tilting bucket formedv and counterbalanced so as to swing from a latch engaging to a load discharging position, and back to latch engaging position, without coming into arresting contact with a stop other than the latch, a latch for holding the bucket in filling position, weight actuated mechanism for disengaging the bucket from the latch, and a filling spout entering the top of the bucket and so disposed as not to contact with it.

HAROLD D. ELFRETH. 

